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What should audio input into the ADSP-21469 EZ-Board look like?

Question asked by PatrickM on May 11, 2011
Latest reply on May 12, 2011 by DeepV



I'm running the sample code in the Examples directory (e.g., C:\Program Files (x86)\Analog Devices\VisualDSP 5.0\214xx\Examples\ADSP-21469 EZ-Board\21469 AD1939 C Sampled-Based Talkthru 48 or 96 kHz).


The problem is that I cannot "see" any output from the board.


My setup is as follows:


Input:  Stanford Research Model DS345 Function Generator driving a 750 Hz signal at 0.600 Volts peak-to-peak.


I can see this signal coming into the board using an oscilloscope.  I can even see it at the input pin of the A2D (where it is approximately 1 v peak-to-peak).


However, I cannot see any output (again, using an oscilloscope).


What should the input signal look like?


Is there a reason that I cannot see the output signal?